There is hereby levied and shall be assessed and collected monthly privilege taxes against the persons on account of their businesses operating within and without Guam measured by the application of rates against values, gross proceeds of sales or gross income, as the case may be. SOURCE: GC § 19540. Amended by P.L. 27-041:2 (Nov. 13, 2003). Subsections (b), (c) and (d) repealed by P.L. 29- 002:VII:1(b) (May 18, 2007). Amended by P.L. 30-230:2 (Dec. 30, 2010), effective 60 days from date of enactment pursuant to P.L. 30-230:5. COURT DECISIONS: Asiatic Trans-Pacific, Inc. v. Maddox, 371 F.2d. 132 (1967)(Apportionment of Gross Receipts Tax)